Underarm Hair Removal: Parameters and Experience for a High-Frequency Area
Why Underarms Matter
Underarms are the most common entry point of hair removal: dense follicles, a small treatable area, and a relatively high anagen ratio (~30-40%), so response is typically faster than on limbs. The skin is thin, folded and relatively pigmented, so parameters and technique need dedicated adaptation.
Parameter Notes
- Wavelength: underarm hair is usually coarse and dark — 808/1064 nm both work well; prefer 1064 nm for darker or tanned skin.
- Pulse width: long pulses (tens of ms) matched to coarse follicles with contact cooling.
- Spot and technique: small-spot touch-ups in the hollow; avoid missed or doubled passes in folds.
- Interval: every 4-6 weeks; typically 4-6 sessions to maintenance.
Experience and Safety
Underarms are pain-sensitive — cooling drives retention: shave before (keep follicles), cool after, no antiperspirant or exfoliation for 24 hours. Apocrine glands are separate from follicles; hair removal does not change sweat output. Reduced odor complaints post-treatment relate to less hair shaft retention and must not be sold as hyperhidrosis treatment.
Clinic View
Low ticket, low decision barrier, high conversion — underarms are the hub for upselling full-body packages. Choose platforms with strong cooling and smooth glide (LEIJEX’s 1200W 808 platform; see the hair-removal program).
FAQ
How many underarm sessions?
Most see major reduction in 4-6 sessions, then 1-2 maintenance visits yearly; hormonal fluctuation raises the cadence slightly.
Can underarms darken after treatment?
Not at proper fluence with cooling; excessive energy causes inflammation and PIH — the whole point of individualized parameters.