Hello,
It can be due to atopic dermatitis or eczema("Atopic" refers to a group of diseases where there is often an inherited tendency to develop other allergic conditions, such as asthma and hay fever). Cheilitis(Inflammation of the skin on and around the lips)is often seen in atopic dermatitis.Diagnosed by bld test like RAST. Treatment is by topical steroids or oral therapy of corticosteroids in severe cases.Topical creams like tacrolimus ointment (Protopic) and pimecrolimus cream (Elidel) are also useful. I suggest you an examination from a dermatologist.
I hope it helps. Take care and regards.
Thank you Doctor,
Do you have an idea if I was allergic to something what it could possibly be if it only occurs when I'm in the sun?
Also, do you think taking oral anti-histamines before I go out in the sun all day will prevent the rash from occurring?
Hello,
From the symptoms it looks like allergic reaction or eczema. You can apply some calamine lotion at the rash as it will help in soothing the skin. Also keep the area well mosituries by using a hypoallergenic mosituriser.
For mild-moderate symptoms a weak steroid may be used , whilst more severe cases require a higher-potency steroid. But they are available under prescription and should be taken only after consulting a dermatologist.
I hope it helps. Take care and regards.