The images show a 13-year-old Indian boy, previously healthy, that presented at our clinic with pruritic nodular lesions throughout the body, ongoing for 3 years, with no fever . He received no treatments besides emollients. At observation he had a combination of multiple hyperpigmented macules, papules and nodules, symmetrically distributed on the extensor surfaces of both upper and lower extremities (Image 1a & 1b), lower back and buttocks (Image 1c). The remaining physical examination was unremarkable .
Image 1a: Nodular and papular lesions in the extensor surface of lower extremities.
Image 1b. Nodular lesions in the legs.
Image 1c: Nodular Lesions on the lower back and buttocks.
These lesions are typical of Prurigo Nodularis (PN), a chronic skin condition characterized by intensely pruritic multiple nodules. It can occur at any age, but it’s more in adults and rarely seen in children. The aetiology is unknown. There is no certainty whether PN is a primary cutaneous disorder or whether it is a reaction secondary to pruritus and itching-scratching triggered by other cause. Many people have an underlying condition that increase the risk of developing PN: atopic dermatitis, contact dermatitis, allergy, diabetes, kidney disease, hepatitis C, HIV, lymphoma and mental health conditions. Some people who develop PN don’ have other conditions linked to it. It is believed that chronic mechanical trauma causes thickening of the skin and leads to plaque-like or nodular lichenification, hyperkeratosis, and pigmentary changes. None of the conditions above was found to be the cause of the described case. Blood tests revealed no alteration and infectious screening was negative. The patient was treated with topical corticosteroids and oral antihistaminic, with a favourable evolution .
Treatment’s goal is to break the itch-scratch-itch cycle. The treatment options range from oral antihistaminic, oral or topical corticosteroids and ultraviolet therapy to immunomodulating agents in the most severe cases. Despite the difficult management with the several treatments available, is a benign condition with a good prognosis .
With this case we aim to alert to the possibility of the diagnosis of prurigo nodularis in pediatric age, even if it’s very rare. Overall, PN is a benign condition, but it can affect children’s quality of life if untreated. The images show the typical locations of the several lesions (macules, papules and nodules) that the Physician should be attentive when suspecting this condition .
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