From the picture, it looks like a mosquito bite.

Suggestion:

Nantong snake medicine can be applied around the wound, or one of the following medicines can be mashed and externally applied, such as Herba Violae, Lobelia Chinensis, Herba Hedyotidis Diffusae and Taraxacum.

If there is no medicine around for the time being, you can fully wash the affected area with soapy water or light salt water, and then apply some vinegar or lemon.

If it itches, don't scratch it with your hands to prevent infection and enlargement.

If it itches badly, you can rinse it with clean water.

I wish you the best of health!