2-mercaptoenzothiazole. As an aid in the treatment of hot spots associated with hair loss; redness; scratching. NADA No. 5-236 approved by Food and Drug Administration. Hartz Hot Spot Skin Medication for Dogs is formulated to be effective as an aid in the treatment of certain common skin inflammations in dogs. Recommended specifically as on aid for Hot Spots (moist dermatitis). Also, Hartz Hot Spot Skin Medication for Dogs is on effective first aid for scrapes and abrasions. Signs: These skin inflammations may be accompanied by itching so intense that the animal rubs, scratches and bites incessantly. Other signs associated with these skin inflammations include hair loss, redness, scaling and secondary infection. www.hartz.com.