Sure, toothpaste might dry out a pimple because of the small amount of sulfur present in the product, but it will not prevent a new one from coming up. Lemon juice might be lightening, but it can also be very irritating for certain skin types and makes you more sensitive to the sun. Tea tree oil and apple cider vinegar are potent anti-bacterials and anti-fungals but they must be used with caution because overuse can burn the skin. Harsh soaps can make acne worse by stripping the skin of its natural oils, sometimes making you break out more because of the imbalance of oil and moisture in the skin. Even worse, coconut oil might have anti-inflammatory properties, but when applied directly to the skin it is actually highly comedogenic and will clog your pores even more than they already are! Finally, egg whites and honey or clay masks may temporarily help to reduce redness, kill bacteria or absorb oil, but they will do nothing to keep you from breaking out.