Good day doc, the inner and outer lips of my vagina hitch and later sore . could this be an infection? and what type of infection please?

These symptoms are typical for vaginal yeast infection. Most yeast infections are easily treated with vaginal creams or suppositories; look for active ingredient ending in "azole" (miconazole, clotrimazole and others), or ask a pharmacist. See a doctor if itching and irritation are severe, or if there are open sores (possible herpes); or if yeast treatment doesn't help within 2-3 days.