Porokeratotic eccrine ostial and dermal duct naevus

Author: Dr Anthony Yung, Waikato Hospital, Hamilton, New Zealand, 2008.

What is porokeratotic eccrine ostial and dermal duct naevus?

Porokeratotic Eccrine Ostial and Dermal Duct Naevus (PEODDN) is a rare congenital disorder of keratinisation. Keratinisation is the process by which the skin cells form in the epidermis. PEODDN is a special type of epidermal naevus.

Porokeratotic eccrine and hair follicle naevus is a very similar entity.

Clinical features

PEODDN is usually present at birth (a birthmark) and becomes more apparent as the person becomes older. However, some cases of PEODDN have been reported to develop for the first time after puberty.

PEODDN is characterised by small discrete scaly papules arranged in a line, most commonly on the palm of the hand (or fingers) or or sole of the foot (or toes). It may extend onto the backs of the hands and feet. There are rare cases of extensive lesions affecting large parts of the body. PEODDN usually becomes more warty in appearance over time and nearly always persists despite treatment.

PEODDN is usually not associated with any symptoms, although, occasionally it can be a bit itchy.

What is the treatment for PEODDN?

Treatments aimed at reducing the thickness of the warty skin in the affected area include:

These treatments are only partly effective.

Destructive methods such as laser resurfacing (e.g CO2 laser), dermabrasion or excision of the area may be used to treat localised PEODDN, sometimes successfully.

Related information

Email Newsletter

Would you like to receive our dermatology updates by email?


Submit your images

We're seeking high-quality photos of skin diseases.  


Machine diagnosis

Watch DermNet's proposal to create a 'Skin Disease Image Recognition Tool' - winner of the 2017 'Clinicians' Challenge Active Award' by the NZ Ministry of Health and HiNZ.

Subscribe to our mailing list

* indicates required
DermNet NZ Newsletter