title: Unusual pigmentation resulting from the use of an intradermal air-propulsion apparatus.
mesh_terms: D002110:Caffeine / Q000008:administration & dosage; D006801:Humans; D007271:Injections, Intradermal / Q000009:adverse effects*; D007277:Injections, Jet / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D010859:Pigmentation Disorders / Q000209:etiology*; D011343:Procaine / Q000008:administration & dosage
chemical_list: D002110:Caffeine; D011343:Procaine