| Allergen | Description | Source | Clinical distribution |
| Urushiol | Poison ivy, oak, sumac | Poison ivy, oak, sumac | Linear pattern |
| Nickel | Metal | Jewelry, buckles, clothing snaps | Earlobes, neck, wrist periumbilical, base of fingers |
| Neomycin | Topical antibiotic | Topical medications | Sites of healing wounds, ear canal |
| Potassium dichromate | Tanning agent | Leather, shoes | Dorsum of feet |
| Thimerosal | Preservative | Topical medications | Face and eyelids, healing wounds |
| Myroxylon pereirae (Balsam of Peru) | Fragrance | Perfumes, soaps, cosmetics, moisturizers | Axillae, neck, face, eyelids, site of application of moisturizer |
| Formaldehyde | Preservative | Topical medications, creams, lotions, shampoo | Face, eyelids, axillae, hairline |
| Quaternium 15 | Preservative | Topical medications, creams, lotions | Face, eyelids, axillae |
| Colophony | Sticky substance from pine and spruce tree trunks | Adhesives, glues, sealants, cosmetics, soaps | Axillae, neck, face, eyelids |
| p-tert-butylphenol formaldehyde | Resin | Leather glues, adhesives, watch straps | Shoes, tape-distribution |
| Wool alcohol | Lanolin | Soaps, emollients, topical medications, cosmetics | Face, hands |
