Allergies and molds are getting more and more common in the general population. What can be responsible for this is dust, cat and dog dander (shed from their furs) in the house and molds developing from leaky roofs. With regard to skin allergies certain chemicals can sensitize the skin and cause allergic dermatitis reactions. Poison ivy is one such irritant. Here are a few links that explain this in more detail.
Basement Mold Removal: http://www.homeadvisor.com/article.show.Basement-Mold-Removal.14548.html
Often water from the ground water leaks into the basement and when the water recedes spores that cam in with the water are starting to sprout. Sensitive people will react to this by coughing, sneezing, getting asthma attacks. The whole basement has to be sanitized with bleach to get rid of the mold. A perimeter drain may have to be installed, if the house was not built to standards to prevent a reoccurrence.
Skin Allergies – ACAAI: http://acaai.org/allergies/types/skin-allergies
The skin is a sensitive organ. When you apply a cream, it vanishes after a short time. Chemicals touching your skin can also be partially absorbed and the immune cells can be sensitized from inside. Once you have been sensitized by a chemical component you produce antibodies and your cell meditated immune system may directly attack the perpetrator the next time you met it. Now redness, inflammation and pain develop as you experience a rash. If this is sever enough you may have to be seen by a physician who likely will prescribe a cortisone cream and tell you to stay away from whatever you have identified as the offending agent.
The Guide to Animal and Insect Allergen-Free Homes: http://www.cleanitsupply.com/t/The_Guide_to_Animal_and_Insect_Allergen-Free_Homes.aspx
Pet allergies and insect allergies are real and very bothersome to those who develop them. The key is prevention of further exposure. If you have developed a cat allergy, for instance, you cannot visit a friend’s home who keeps a cat at the home. Even a short visit would just exaggerate the allergy to cats as you inhale minute protein particles in the air and dust. Keep your own home clean. Avoid wall-to-wall carpeting where a lot of dust can hide. This is particularly important for those who have dust mite allergies. An allergist can offer allergy injections based on skin tests to desensitize you, but it does not work well for dog and cat allergies.