Hi, You said that your son has reddish pimple like lesions on face around nose and mouth and spread to other areas. He has taken all vaccinations. With this much history, I assure you that it is not measles. But, most probably it may be impetigo. It is a bacterial infection caused by staphylococci. You consult dermatologist for firm diagnosis. Antibiotics and antiinflammatory drugs in proper dose may be considered. Antibiotic like sisomycine cream may be applied on lesions twice a day and in nostril at night. Give him bath with few drops of dettol containing water. Improve his immunity with nutritious food after taking advice from his paediarician. I hope this would help in managing his skin problem. Thanks. Dr. Ilyas Patel MD