Case report: Dermatosis neglecta mimicking pemphigus foliaceus in association with obsessive-compulsive disorder

Dermatosis neglecta (DN) is a frequently underrecognized skin disorder that occurs due to unconscious or conscious neglect of self-cleaning, causing the accumulation of keratin, sweat, sebum, and impurities. It is characterized by asymptomatic yellowish-to-brownish, waxy, adherent papules or plaques with cornflake-like scales that mimic several dermatological conditions. DN awareness is crucial for avoiding unnecessary invasive diagnostic procedures. Its lesions can be removed with some difficulty by ordinary cleansing and efficiently cleared with ethyl or isopropyl alcohol. Individuals with underlying physical or mental disabilities or psychiatric conditions are highly associated with DN. Nevertheless, supportive evidence for the coexistence of DN and psychological conditions is sparse, and most individuals with mental problems usually deny having psychiatric issues. Here, we present a case of DN resembling pemphigus foliaceus on the face with obsessive-compulsive disorder in a 16-years old male. The definitive diagnosis of DN in this patient was confirmed via histopathological examination. The lesions completely disappeared after appropriate facial cleansing and psychiatric management. DN may reveal underlying psychiatric disorders in patients.

Dirty Papules and Plaques in Skin of Color: New Observations by Dermoscopic Dissection

Context

Confluent reticulated papillomatosis (CRP), terra-firme-forme-dermatitis (TFFD), and dermatitis neglecta (DN) are the benign, acquired conditions that present with dirty-looking hyperpigmented and hyperkeratosis lesions on neck, back, and truncal areas. They pose difficulty in diagnosis because of their clinical similarities and thereby in treatment approaches. Bedside test and histopathology is helpful in the diagnosis. Dermoscopy is utilized as an evidence-based diagnostic method.

Aims

To evaluate and to compare the dermoscopic patterns among CRP, TFFD, and DN and to correlate them in terms of histopathological features.

Materials and Methods

It was a cross-sectional observational study with a total of 62 patients, among whom 30 were CRP, 20 had TFFD, and 12 were diagnosed as DN. Clinical and dermoscopic evaluation was done in all patients, and histopathology was carried out in selective cases to confirm the diagnosis.

Results

Global view of dermoscopy in CRP revealed a cerebriform pattern. The arrangement of pigment globules was characteristic in CRP, TFFD, and DN, giving a "cobblestone," "mosaic," and "cornflake-like" appearance, respectively. The color of the pigment globules was strikingly significant. Yellow globules were predominant in CRP and TFFD, having p values of 0.001 and 0.004, respectively. Scales were conspicuously present in CRP, with a statistically significant p value of 0.003. Focal white areas and hair changes were observed in CRP alone, whereas black dots were found only in TFFD.

Conclusion

Dermoscopy acts as an in vivo and a noninvasive, rapid technique in the diagnosis of clinically look-alike conditions. It demonstrates characteristic features in CRP, TFFD, and DN. Thus, it is an evidence-based diagnostic method that assists the treating physician in daily clinical practice.