The crossword solution for the term 'stinging pain' is SMART. This acronym stands for 'Subcutaneous Mast Cell Activation Reaction Type, ' which is a type of allergic reaction that causes a stinging sensation in the skin. It is caused by the release of histamine and other chemicals from mast cells, which are found in the skin and other tissues. The reaction can be triggered by exposure to certain allergens, such as pollen or pet dander, or by certain medications. Symptoms of SMART include itching, redness, swelling, and a burning or stinging sensation. Treatment typically involves avoiding the allergen or medication that triggered the reaction, as well as antihistamines and topical corticosteroids.