As you get older, the sensitivity of your skin increases. For instance, you may find that you’re able to stay out in the sun for only half the time you could 5 or 10 years ago before you start to burn.

This increase in your skin’s sensitivity also extends to exposure to chemicals, cosmetics, and certain types of plants. If you notice that red patches suddenly appear on your neck, it’s likely that your skin is reacting to a substance to which it is highly allergic. This reaction is a condition called contact dermatitis. Poison ivy is one form of contact dermatitis; so is a rash that forms when you try a new cosmetic.

Within a day or two after you’re exposed to the new allergen, red patches will start to appear in the affected area, and they’ll probably be itchy. In some people, blisters will also form a few days later. The entire episode, from the initial exposure to the allergen to when the rash clears up, usually lasts about a week or two.

A person can also have an allergic reaction due to anxiety or other emotional stresses in her life.

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