Table 1.

Characteristics of ICD and ACD from TTS (modified from (2))

	ICD	ACD
Morphology	Erythematous-papular/vesicular/bullous lesions sharply circumscribed to the area of contact.	Erythematous-papular/vesicular/bullous lesions (vesiculation is more typical) circumscribed to the area of contact but with ill-defined limits. Dissemination of the lesions can occur
Symptoms	Burning, stinging, itching	Burning, stinging, itching
Resolution	Characterized by decrescendo phenomenon following patch removal; typically within 48 h	Characterized by crescendo phenomenon. Resolution is slower than ICD
Clinical diagnosis	On the basis of lesions and clinical course	Patch testing with the individual components of the TTS