I'm an adult and I have Acne!

Well all I can say is GOOD GRIEF! I am an adult woman I got up this morning and I have acne on my chin! So I guess I'm going to Walmart to buy an acne treatment. I hope I can fool everybody into thinking it is for my daughter. Talk about embarrassing! I really wonder why an adult would get acne. I mean I thought you grew out of it when a person grows up. I guess not.