Fig. 1

a–c Images of patient’s skin lesions at week 3: small keratotic papules, hyperpigmentation over the PIP and DIP joints, Gottron`s sign; d Microscopic examination of H&E stained sections: keratotic plugs within dilated follicular ostia similar to that seen in keratosis pilaris and a sparse perivascular lymphocytic infiltrate; e Marked perifollicular deposition of mucin on alcian blue staining. The slides were digitalized with ScanScope CS2 (Aperio Technologies, Vista, CA), no further image processing was performed