Irradiation with UV light has a calming effect on the immune system
and slows the growth of overactive skin cells. In psoriasis, the
radiation inhibits cell growth and reduces skin scaling; in
vitiligo, it stimulates repigmentation.
UVB narrowband (311 nm) is today the gold standard
for psoriasis and vitiligo, more targeted than
classic broadband UVB. UVA (340–400 nm) works
particularly well for atopic dermatitis.
Combination therapies such as PUVA (psoralen + UVA) or
balneophototherapy are also available. The right choice
is made by the treating physician.
311 nm
UVB narrowband
Psoriasis · Vitiligo
340–400 nm
UVA
Atopic dermatitis · Eczema
PUVA
Combination therapy
Psoralen + UVA