Allergic contact dermatitis
New Zealand Dermatalogical Society Incorporated. Published online at: http://www.dermnetnz.org
Allergic contact dermatitis is an allergic reaction caused by delayed hypersensitivity to an external agent. It typically appears where the contact takes place which may suggest the cause of the allergy.9,10 For example, a reaction underneath a watch would suggest a reaction to the metal.
Common causes include:9,10
Like eczema, allergic contact dermatitis is often not well demarcated.
However, it often appears on areas of the body that are not commonly affected by eczema.10
 Nickel |
 Rubber |
 Toiletries |
 Dyes and inks |
 Leather |
 Plants |
 Lanolin |
 Preservatives |
 Local anaesthetics |
 Colophony (found in plasters, adhesive tapes, sealants etc) |
References:
- 9.Buxton PK (1998) ABC of Dermatology. 3rd edition. London, BMJ Publishing Group
- 10.Graham-Brown R, Bourke J, Cunliffe T. Dermatology. Fundamentals of Practice. Mosby Elsevier, London 2008