Brief Answer -
Contact dermatitis can be caused by an irritant or an allergen.
Explained Answer -
The appearance of the two types is similar, but the symptoms of irritant contact dermatitis usually become apparent shortly after exposure.
while an allergen may take up to 10 days for the initial reaction.
However, once you’re exposed to an allergen, even brief contact with a small amount in the future will cause an
allergic reaction within 24 to 48 hours.
Since the skin affected is on your ankles, a common allergic reaction is from poison ivy.
However, your laundry detergent, sunscreen, topical medications and even the fabric of your clothing can cause
allergic contact dermatitis.
Irritants that may be to blame for your itchy ankles are soaps, housecleaning chemicals and ankle bracelets.
If you scratch
insect bites, the skin can become red and inflamed.
Hope you will find it out helpful.
Thanks & Regards,
Dr. Gaurav Prajapati