A large group of contactants was found to yield positive patch tests much more often in stasis dermatitis than in other forms of dermatitis. Most of these substances were topically applied medicaments and aromatic amines. Positive tests for the other contactants (including potassium dichromate, nickel sulphate, cobalt chloride, mercaptobenzothiazole, tetramethylthiuram disulphide and formaldehyde) were not significantly more frequent in stasis dermatitis than in other forms of dermatitis.