A 5 yr old male child has multiple hyperpigmented macules over the trunk. On rubbing the lesion with the rounded end of a pen, he developed uicarial wheal confined to the border of the lesion. Most likely diagnosis:
Gentle rubbing of a lesion causes local itching, erythema, and wheal formation after 2-5 minutes which may be present for 30 min or few hrs. This is the Darier's sign and is seen in uicaria pigmentosa.
FDE
LP
Uicaria pigmentosa
Uicarial vsaculitis
Naevi and vessel related disorders