Allergy to chalk dyes.
D004396:Coloring Agents / Q000009:adverse effects*; D003877:Dermatitis, Contact / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010328:Patch Tests; D014581:Urticaria / Q000209:etiology*
D004396:Coloring Agents