Urticarial dermatitis seems to be a useful histological and clinical term for a subset of the dermal hypersensitivity reaction pattern.
Histopathological features of urticarial dermatitis:
– Slight epidermal spongiosis with superficial perivascular lymphocytes and interstitial eosinophils
– Perivascular eosinophils that spill interstitially into the surrounding dermis
Clinical features of urticarial dermatitis:
A, Urticarial papules and plaques.
B, Urticated erythematous patches.
C, Urticated papules predominating.
D, Dusky urticated plaques.