How often should you use IPL on underarms?

Short answer: Even for underarms, IPL is best used no more than once per week during the starter phase. Using it more often does not speed up results and may increase irritation. As regrowth slows, increase the spacing and do occasional maintenance touch-ups.

For the full cadence from starter phase to maintenance, see: IPL Hair Removal Schedule.

Why underarms can feel more sensitive

Underarm skin is often more sensitive and may be naturally darker than nearby areas. That’s why comfort matters more than speed: if you push frequency or intensity too hard, you may create irritation and need longer breaks.

If your underarms are naturally darker, see: How should you treat areas that are naturally darker (underarms/bikini) than the rest of your skin?

How often is “too often” for underarm IPL?

Underarms are a small area, so it’s easy to think “more sessions = faster results.” In practice, that usually backfires. A safer approach is to keep spacing controlled long enough to build consistency, then increase spacing when regrowth slows.

Underarm IPL schedule showing starter phase, transition spacing, and maintenance touch-ups
Underarm IPL works best with controlled spacing—treating more often doesn’t speed results.
  • Starter phase: treat up to once per week (or less if your skin needs more recovery).
  • Transition phase: increase spacing as regrowth becomes finer and less frequent.
  • Maintenance: do quick touch-ups when regrowth returns (instead of treating on a strict weekly rhythm).

What to do if underarm regrowth is stubborn

Underarms can have dense, coarse hair. If progress feels slow, avoid the “twice-a-week trap.” Technique and consistency usually matter more than extra sessions.

Technique check: Place the Window Flat During IPL Use  •  Move Slowly, One Area at a Time

When to increase spacing instead of increasing frequency

  • Redness or sensitivity is stronger than usual
  • Skin feels tight, itchy, or uncomfortable after treatment
  • You recently had sun exposure or the area looks uneven in tone

Helpful: What skin reactions are normal after using IPL?  •  Can IPL cause burns or skin damage if used incorrectly?

Prep tips that make underarm sessions easier

  • Shave first and keep skin clean and dry
  • Avoid deodorant right before treatment (apply after your skin feels calm)
  • Don’t rush—missed patches often look like “no results”

Prep guides: Skin Prep Guide  •  Shave the Area Before Using MITHLUX S2 PULSE

Back to the full schedule guide: IPL Hair Removal Schedule

For complete usage limitations and operating steps, consult the MITHLUX S2 Pulse User Manual.