Hi Judi, the first line of defense against these pesky creatures is avoidance. Since mosquitos are attracted to smells, you should avoid wearing perfumes and strong hairsprays in the summer. Insect repellents such as DEET are also very effective. Some recommend taking one tablet of vitamin B-1 twice a day as a use to repel these nasty creatures.
If you do fall victim to mosquitoes, there are a number of remedies you can use to help with the discomfort of their stings. Instead of scratching, try hitting the bite. It is the scratching that will cause swelling. You can also apply an ice pack to deal with the symptoms or use cool compresses. Calamine lotion or anti-itching lotions such as a 1% hydrocortisone cream will help to relieve the itching. Anti-inflammatory drugs and antihistamines can control your symptoms as well.
Among the remedies found in your home, mint toothpaste is probably the best known. By applying this to the infected area, the itching and swelling will be relieved. Putting rubbing alcohol or vinegar on the area is also effective. Mixing meat tenderizer with water or vinegar to form a paste, and spreading it over the swelling is something else you can try. Some claim a deodorant or antiperspirant rolled over the area will do the trick. Visine or plain old lemon juices are also some remedies. If all else fails, you can always try an oatmeal bath.