Congenital psoriasis without an underlying nevus following the lines of Blaschko is described in a 6-year-old girl. In addition to this special type of psoriasis, she suffered from atopic dermatitis. The lesions were aggravated by sun exposure and phototherapy treatments, as well as by upper airways infections, without any clear explanation of these trigger factors. We propose to call this form of psoriasis congenital blaschkoid psoriasis.