[P152] Pigmented contact dermatitis from henna: A report of 11 cases

The henna is a vegetable hair dyes that can be recommended to the patients who are sensitized to oxidative dyes due to their low allergenicity. In recent years, there have been an increasing number of reports on the pigmented contact dermatitis after henna. Herein, we report 11 cases of pigmented contact dermatitis due to henna. Eleven female patients aged 50-64 visited our clinic, presenting with hyperpigmentation in the lateral side of face and neck. They all had dyed their hair with pure henna powder for 1-9 times and the pigmented lesion was developed within 2-10 months after hair coloring. Histopathology revealed liquefaction degeneration of the epidermis with pigmentary incontinence in the papillary dermis in all patients. Epidermal atrophy with rete ridge flattening was also observed in 3 cases. A diagnosis of pigmented contact dermatitis from henna was made. They were treated with vitamine C iontophoresis and low-pulse energy 1,064-nm Q-switched (QS) Nd:YAG laser once a week but the lesion remained with little improvement. Hair dyeing with henna is associated with pigmented contact dermatitis in middle-aged women and it is difficult to treat. Because it occurs mostly in middle-aged women and requires long-term treatment, careful attention should be paid when hair dyeing in this age group with henna.