A pimple is a type of skin lesion that is caused by inflamed and/or obstructed pores. The most common cause of pimples is acne. Pimple is a small inflamed elevation of the skin; a pustule or papule. Some say popping a pimple can scar, others say it can't scar. I tend to think that lancing and gently squeezing pimples that are at the surface and white will usually not lead to scarring. However, trying to squeeze a pimple that is still below the surface may lead to major problems.

Inside the pore are little sebaceous glands which produce sticky sebum. When the outer layers of skin shed (as it does continuously), the dead skin cells left behind may become 'glued' together by the sticky sebum. This causes a blockage in the pore, especially when the skin becomes thicker at puberty.

Some of the tips and homeremedies for the care in Pimples are as follows:

Drink water, lots of it, it helps rid your body of impurities.
Try to avoid soda as much as possible, it isn't too good for your health either way.
Don't over-wash/cleanse your skin, you will end up stripping the skin of its natural oils, causing it to overproduce oil to make up for the loss, which means, greasy skin.
Always be sure to moisturize, most people have oily skin because they don't use lotion, it sounds contradicting, but its true, just refer to the previous suggestion. If you do happen to have naturally oily skin, then carefully choose your moisturizer, make sure it is oil-free and light-weight. 

Keep your hair on your head clean, you'd be surprised at how the hair on your head can affect the skin on your face. The oil can seep down onto your forehead, so beware.
Avoid tanning booths, and excessive unprotected exposure to sun. UV rays will irritate acne and may cause breakouts to worsen.
Be sure to try and eat healthy, i'm not saying to avoid stuff like chocolate, cuz boy do i love the stuff, and it does NOT cause acne, just lessen up on greasy foods, etc
Wash your face often with amild soap and water often. Stay away from make-up it clogs your pores.
Mix ground orange peel with water to form a paste and apply to the affected spots. Wash with warm water after twenty to thirty minutes.
After bathing take a quater slice of lemon and squeeze it in one mug of luke warm water alongwith one table spoon of salt adding it and take your last bath with it. Apply it twice daily and within 15 - 25 days you will see the results.
Good hygene which involves regular bathing helps a lot. Good internal health is a major contributor to healthy skin.
Wash problem areas with a gentle cleanser. Products such as facial scrubs, astringents and masks generally aren't recommended because they tend to irritate skin, which can aggravate acne.
Avoid irritants. You may want to avoid oily or greasy cosmetics, sunscreens, hair-styling products or acne concealers.