<s>[INST] my 15 year old son has severe psoriasis of the scalp , covers whole scalp, we were using prescription lotions, but no improvement. since last two weeks he has swollen neck lymph nodes . I will take him to doctor again but was wondering , can psoriasis be the cause of swollen nodes? [/INST] Hi. Thanks for posting your concern at ChatDoctorPsoriasis can be a cause of swollen lymph nodes and specially when it is severe erythrodermic psoriasis, dermatopathic lymphadenopathy is a well known association of severe psoriasis. Localised scalp psoriasis can give rise to regional cervical lymphadenopathy specially if it is very inflammatory OR is complicated by oozing and crusting due to secondary infection. Take care regards </s>