<unk>  affects 1 to 5% of the general population. It is slightly more common in men, but affected women tend to have more severe symptoms. The condition usually recurs throughout a person's lifetime.<unk>  can occur in any age group but usually starts at puberty and peaks in incidence at around 40 years of age. It can reportedly affect as many as 31% of older people. Severity is worse in dry climates.
Seborrhoeic dermatitis
Psoriasis
Streptococcal intertrigo
Atopic dermatitis
Intertrigo
Rosacea
Rodent mite dermatitis
Lupus