How do you stop the spread of achene?

Do you mean Acne?: I assume u mean Acne? Acne is not contagious like a virus or poison ivy, and doesn't spread by touch. Acne is due to a combination of androgen hormone activity, excessive sebum production, clogged pores, inflammation and secondary infection. Individuals are affected differently in severity and affected areas. There are several treatment options depending on severity. See ur dr to discuss options.