Scrubbing your face daily with grainy cleansers and exfoliating products can do more harm than good. When done too often, it can cause redness, inflammation, and irritation. “Exfoliating a pimple can pull away healthy skin cells and create an open wound and higher risk for scarring,” says Jessica Weiser, MD, from New York Dermatology Group. “Exfoliation should be done with caution, and not more than 2-3 times a week maximum.”
Ans: Yes, lemon is very effective in removing pimples. It has a mild astringent property that reduces the oil production and tightens the skin. The vitamin C rich content will trigger the collagen production and thereby encourages the formation of new skin cells. Its natural bleaching property helps to reduce the appearance of acne marks on the skin.
Consider exfoliating with baking soda. Baking soda can be used to exfoliate the skin and minimize the appearance of acne scars. All you need to do is mix one teaspoon of baking soda with two teaspoons of water to form a liquid paste. Apply this paste all over your face and use gentle circular motions to rub the baking soda into the skin, concentrating on the scarred areas, for about two minutes. Rinse off with warm water and pat the skin dry. 
If a pore gets clogged up and closes but bulges out from the skin, you're left with a whitehead. If a pore gets clogged up but stays open, the top surface can darken and you're left with a blackhead. Sometimes the wall of the pore opens, allowing sebum, bacteria, and dead skin cells to make their way under the skin — and you're left with a small, red bump called a pimple (sometimes pimples have a pus-filled top from the body's reaction to the bacterial infection).
Love it!...In love!...I got this product as a free sample from Kate Somerville and I'm so glad I was able to try it out because this really has helped my acne so far!...I have pretty oily skin and gets lot of breakouts and redness around my nose and chin, and after using this for just a few days at night my skin looks a lot more even and no new pimples!
Acne (acne vulgaris, common acne) is a disease of the hair follicles of the face, chest, and back that affects almost all teenagers during puberty -- the only exception being members of a few primitive Neolithic tribes living in isolation. It is not caused by bacteria, although bacteria play a role in its development. It is not unusual for some women to develop acne in their mid- to late-20s.