Every summer the left leg knee can have blister and still itch is how

Every summer, blisters and itching occur on your left knee, which may be caused by allergic dermatitis or eczema. You need to go to the dermatology department of the hospital for examination to confirm the specific cause. If allergic dermatitis is caused, you can apply mupirocin ointment locally and take loratadine and other antihistamines orally.