Activation of Notch1 in the hair follicle leads to cell-fate switch and Mohawk alopecia.

The Notch signaling pathway has been shown to control cell-fate decisions during mouse development. To study the role of Notch1 in epidermal differentiation and the development of the various cell types within the mouse hair follicle, we generated transgenic mice that express a constitutive activated form of Notch1 under the control of the involucrin promoter. Transgenic animals express the transgene in the suprabasal epidermal keratinocytes and inner root sheath of the hair follicle, and develop both skin and hair abnormalities.

Modulation of linear nail growth to treat diseases of the nail.

Diseases affecting the nail can cause significant distress and interfere with an individual's self-esteem, personal relationships, and professional life. Often, hand and foot function is adversely affected. Certain diseases are characterized by accelerated nail growth while others show a decrease.

Dyshidrotic-like spongiotic dermatitis after intravenous immunoglobulin therapy.

Intravenous immunoglobulin (IVIG) therapy has been used to treat a variety of immune mediated disorders. Cutaneous reactions to IVIG are rare and have only been anecdotally described. We describe three cases with dyshidrotic-like biopsy proven spongiotic dermatitis after administration of IVIG.

Generalized acanthosis nigricans in an otherwise healthy young child.

Acanthosis nigricans in children is usually a benign condition most commonly associated with obesity. Generalized acanthosis nigricans is a very rare condition, especially in childhood. We report a 6-year-old boy with a 4-year history of generalized hyperpigmentation and velvety thickening of the skin.

Follicular unit extraction: minimally invasive surgery for hair transplantation.

Background: Follicular Unit Transplantation (FUT) is performed using large numbers of naturally occuring individual follicular units obtained by single-strip harvesting and stereo-microscopic dissection. Donor wound scarring from strip excision, although an infrequent complication, still concerns enough patients that an alternative solution is warranted.

Objective: The purpose of this paper is to introduce Follicular Unit Extraction (The FOX Procedure), in which individual follicular units are removed directly from the donor region through very small punch excisions, and to describe a test (The FOX Test) that determines which patients are candidates for this procedure.