Because every wash strips the barrier: soap and hot water dissolve the oils cementing your outer skin cells, and evaporation off damp skin takes more moisture with it - the AAD's fix is lukewarm water, pat dry, then cream or ointment on still-damp skin to trap the water.
Ointments beat lotions, fragrance-free stings less on cracks, and a thick layer under cotton gloves overnight repairs deep damage. Do not wash less - the hygiene matters; repair the barrier instead. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper .
What to do
Common questions
Why do I get chapped hands from washing?
Because every wash strips a little of the barrier that keeps moisture in, and winter plus frequent washing strips it faster than skin can rebuild. The mechanism: soap and hot water dissolve the natural oils cementing your outer skin cells together, water evaporating off damp skin takes more moisture with it, and the result is the tight, cracked, sometimes bleeding knuckles of a compromised barrier. The AAD's handwashing survival protocol is precise and it works: wash in lukewarm water (hot strips more), pat - do not rub - dry, and apply hand cream or ointment to still-damp skin, working it into fingertips and nails, because moisturizer on damp skin traps the water instead of replacing it. The product details that matter: ointments and creams beat lotions (more oil, less water), fragrance-free formulas sting less on cracked skin, and a thick layer under cotton gloves overnight is the heavy artillery for knuckles already splitting. The fix that is not on the list: washing less - the hygiene matters more; barrier repair is the answer, not dirtier hands. Cracks that fissure deep, weep, or show infection signs deserve a clinician - hand eczema and contact dermatitis are treatable with prescriptions.