1. The most common location of sun allergy
is "V" of the neck, and the immune system take this allergy as 'foreign' and activates immune defense against them in form of rash-blister
2. As there are no associated complaints, it means that it is asymptomatic, could be simple cyst; still consultation with a general surgeon
will relieve your anxiety
, who will do a physical examination and might ask for ultrasound
of the neck OR histopathology report and diagnosis.
3. make sure from next time you apply a good sunscreen and limit your outdoor activities during peak hours 11 AM to 4 PM.
4. Ask your doctor whether you should take any special precautions to avoid sun exposure while you are on the drug. (if prescribed any)