Metals
This is the most frequent cause of persistently positive patch test reactions.
Gold
This allergen is often positive in patients with hand dermatitis due to rubbers.
Also seen in hair dye, henna, photography ink
Cyanoacrylates - ethyl cyanoacrylate/Krazy glue
OR
Methylacrylate - used for artificial nail plates, bone/joint prostheses
This allergen is seen in many creams, lotions as well as in antifreeze.
Propylene glycol.
This is the most common sunscreen allergen.
A patient presenting with white reticulation of the buccal mucosa may be reacting to this.
Mercury - oral lichenoid reaction due to mercury amalgams.
May also be seen with gold.
This is the most common allergen in health care workers.
Thiuram (tetramethylthiuram disulfide)
Most common glove allergy
This is the #1 preservative-sensitizer in the US.
Quaternium-15/Dowicil 200 (formaldehyde-releaser)
Soaps, shampoos, moisturizers
This allergen common in leg ulcer patients and made from wax-wool cross reacts with aquaphor and eucerin.
LANOLIN.
The Japanese Lacquer Tree cross reacts with what plant family.
Anacardiacea (toxicodendron genus)
Uroshiol is sensitizer --> poison ivy, oak, sumac
Also seen with cashew nutshell, mango rind, ginko pulp, brazilian pepper tree, indian marking nut
A professional pool player with a severe hand dermatitis likely has an allergy to this.
Chromate - found in dyes (green felt on pool table)
Also: leather shoes, cement
Patients with spina bifida are at an increased risk of this allergy
Latex allergy.
A child with perianal erythema and pruritus may have an allergy to this product/allergen.
Wet wipes/Kathon CG.
Methylchloroisothiazolinone (MCI)
Methylisothiazolinone (MI)
Balsam of Peru is derived from this tree.
Myroxylon pereira.
Dandelion, sunflowers and chrysanthemum are all sources of this contact allergy.
ACD due to the compositae/asteraceae family -> sesquiterpene lactone
Cross reacts with permethrin
These are three metals that are safe in patients with nickel allergies.
Titanium, platinum, sterling silver
A patient with an allergy to dialkyl thioureas with a full body eruption may have this profession/hobby.
Surfer - wet suit, neoprene dermatitis; also seen in allergy to goggles.
This allergen may be found in leather goods and can lead to depigmentation.
p-tert-butylphenol formaldehyde resin (PTBP)
Gluing together leather goods
Eyelid dermatitis due to nail polish is often caused by this.
Tosylamide formaldehyde resin (toluene-sulfonamide)
Nailpolish/laquer
Eyelids, finger/periungual
This is the best Group A corticosteroid screening agent.
Tixocortol pivalate
This test will turn pink in the presence of nickel.
Dimethylglyoxime in 10% ammonia.
Bananas, avocados, chestnut, kiwi, passionfruit
Parabens cross react with --- name PPPASTA
Para-aminosalycilic acid, PABA, PPD, Azo dyes, sulfonamides, thiazides, ester anesthethics
Allergy to hair bleach (ammonium persulfate) can cause this reaction.
Contact urticaria and generalized histamine reaction.
Onions, GARLIC (non-dominant hand, finger tips), chives
Alliaceae --> diallyl disulfide