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Post-Laser Hair Removal: The First 48 Hours
Redness and sensitivity are expected. Blistering and hyperpigmentation are not. Here is exactly what your skin is doing in the first two days after treatment — and how to support it.
PSRx Clinical Team · 5 min read · Post-Care
Laser hair removal works by delivering concentrated light energy into each hair follicle. That energy converts to heat, which damages the follicle enough to disrupt future growth. It is a precise process — but it is still thermal energy passing through living tissue, which means the 48 hours after your session matter significantly for how your skin recovers and what your results will look like over time.
At PSRx, our providers in Chicago treat clients across every Fitzpatrick skin type. Post-care guidance is not one-size-fits-all, and some of what follows will apply more specifically depending on your skin tone and the body area treated. Pay attention to the skin-tone-specific notes throughout.
What Is Normal in the First 48 Hours
Immediately following your session, most clients notice erythema — clinical redness — around the treated follicles. The skin may look slightly pink or feel warm to the touch. This is the expected inflammatory response as your body recognizes heat-affected tissue. In the majority of cases this resolves within 2 to 24 hours.
Small raised bumps resembling mild folliculitis are also common, particularly in denser treatment areas like the underarms, bikini line, and legs. These perifollicular papules (bumps around the hair shaft) are not an allergic reaction — they are your body mounting a normal inflammatory response at the follicle level. They typically resolve within 24 to 48 hours without any intervention.
Normal — no action required
- Pink or red skin, warm to the touch
- Small bumps at the follicle opening (perifollicular edema)
- Mild sensitivity or tingling for up to 24 hours
- Hair that appears to "shed" or push out over the next 1–3 weeks
The shedding you notice in the weeks after treatment is not regrowth. It is the treated hair being expelled from the follicle as the damaged root releases it. You may notice stubble pushing through the surface starting around days 7 to 14 — this is a sign the treatment worked. Do not wax or tweeze these hairs out; let them shed naturally or shave if needed.
What Is Not Normal and When to Contact Your Provider
Contact your provider if you notice:
- Blistering or open wounds at the treatment site
- Burns that progress or worsen after 48 hours
- Severe swelling that extends beyond the immediate treatment zone
- Crusting that covers large areas rather than isolated follicles
- Dark discoloration (brown or ashy patches) appearing in the first week
Blistering can occur when too much energy is delivered to skin that was not adequately prepared — sunburned skin, skin that had a recent self-tanner application, or skin treated with the wrong laser settings for the client's Fitzpatrick type. At PSRx, every laser session begins with a settings review based on your documented skin tone and treatment history, which significantly reduces this risk.
What to Apply to Treated Skin
Recommended applications immediately post-treatment:
- Cool compress — a damp cloth or cold pack wrapped in a thin layer of fabric. Apply for 10–15 minute intervals to reduce heat and inflammation. Avoid direct ice application.
- Pure aloe vera gel — look for formulations with no fragrance, dyes, or alcohol. Aloe is soothing and anti-inflammatory without introducing any occlusive barrier.
- Gentle, fragrance-free moisturizer — Vanicream or CeraVe Moisturizing Cream are appropriate options. Keep the skin hydrated; do not let treated areas dry out.
Avoid applying anything with active ingredients — retinoids, glycolic acid, salicylic acid, or niacinamide — for at least 48 to 72 hours post-treatment. These ingredients can increase photosensitivity and irritation in already-compromised skin.
What to Avoid for 48 Hours
Heat is the primary risk factor in the first two days. Your treated follicles are already thermally stressed. Adding more heat — whether from a gym workout, sauna, hot shower, or hot tub — extends the inflammatory response and increases the risk of post-inflammatory hyperpigmentation (PIH), especially in Fitzpatrick IV through VI skin tones.
- No strenuous exercise for 48 hours. Elevated body temperature and sweat can irritate open follicles and introduce bacteria.
- No saunas, steam rooms, or hot baths. Warm showers are acceptable; hot water is not.
- No direct sun exposure. Use SPF 30 or higher on any exposed treated areas the moment you leave the clinic. Sun on freshly lasered skin is one of the most reliable causes of post-treatment hyperpigmentation.
- No exfoliation. Avoid scrubs, washcloths used with friction, chemical exfoliants, and loofahs for a minimum of 72 hours.
- No tight or synthetic clothing over treatment areas. Opt for loose, breathable cotton to minimize friction and heat retention.
- No deodorant or antiperspirant on underarm treatment areas for 48 hours. Many deodorant formulations contain aluminum compounds and fragrance that can cause contact dermatitis on compromised skin.
Skin-Tone Specific Considerations: Fitzpatrick IV Through VI
Clients with deeper skin tones carry more melanin in both the hair follicle and the surrounding epidermis. This is precisely why laser selection and settings matter so much — but it is also why post-care discipline is even more critical for this group.
Post-inflammatory hyperpigmentation (PIH) — darkening of the skin at the treatment site — is more likely to develop in Fitzpatrick IV through VI clients following any heat-based treatment. PIH is not permanent in most cases, but it can take weeks to months to fully resolve. The behaviors that accelerate PIH are exactly the ones listed above: sun exposure without SPF, heat, friction, and touching or picking at the area.
Additional recommendations for Fitzpatrick IV–VI clients:
- Apply broad-spectrum SPF 50 daily to treated areas, even when indoors near windows
- Ask your provider about a post-treatment melanin-suppressing protocol if you have a history of PIH
- Avoid any heat exposure for a full 72 hours rather than 48
- Document your skin after each session so you and your provider can track any pigment changes
If you are being treated at our Chicago location and have questions about how your skin type affects your protocol, bring it up before your session. Our providers adjust settings conservatively for first sessions with deeper skin tones and build incrementally based on your response. Learn more about how we approach laser hair removal at PSRx, or complete our skin assessment so we have a full picture of your history before you come in.
Shedding vs. Regrowth: How to Tell the Difference
One of the most common post-treatment concerns is clients noticing hair appearing through the skin in the weeks after their session and assuming it means the treatment failed. In most cases it did not.
Laser energy disrupts the follicle at the root. The hair shaft above that root does not disappear instantly — it takes 1 to 3 weeks for the damaged root to release the hair, which then pushes up through the skin and sheds. This is called exogen phase shedding. You can often pull this hair out with minimal traction, or it will fall out on its own. It will not continue to grow.
True regrowth — from follicles that were not in the active growth phase (anagen) during treatment — appears more slowly, grows longer, and feels more resistant when pulled. This is why laser hair removal requires multiple sessions spaced 4 to 8 weeks apart: each treatment catches a new cohort of follicles that were in anagen during that cycle.
If you have questions about what you are seeing on your skin between sessions, document it and bring it to your follow-up. Most ambiguity resolves quickly with a provider review.
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