The main cause is a type-I hypersensitivity reaction to products containing<unk> <unk> , such as the rosin/colophony, which is commonly used as a friction-increasing agent. Players of bowed string instruments (violin, viola, cello, double bass) rub cakes or blocks of rosin on their bow so it can grip the strings. Ballet and flamenco dancers sometimes rub their shoes in powdered rosin to reduce slippage before going on stage. Gymnasts, baseball pitchers and ten pin bowlers use rosin to improve grip. Common locations of this contact<unk>  are hands, face and neck. It has also occurred as a result of dehydroabietic<unk>  in an over-the-counter hydrocolloid dressing.
Abietic acid dermatitis
Phytophotodermatitis
Phototoxic tar dermatitis
Ichthyosis acquisita
Urticaria pigmentosa
Lacquer dermatitis
Alopecia mucinosa
Dermatopathia pigmentosa reticularis