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. There is a possibility that molds develop also 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.
Often water from ground water leaks into the basement. When the water recedes spores that came in with the water and sprout. Sensitive people will react to this by coughing, sneezing, getting asthma attacks. In this scenario you have to sanitize the whole basement with bleach to get rid of the mold. If a perimeter drain is missing you may have to instal one. Many houses are not built to standards.
Skin Allergies – ACAAI
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. Your cell mediated immune system may directly attack the perpetrator the next time you meet it. Now redness, inflammation and pain develop as you experience a rash. If this is severe enough you may have to see a physician. The physician likely will prescribe a cortisone cream. He also will tell you to stay away from whatever you have identified as the offending agent.
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, you cannot visit a friend’s home who keeps a cat at the house. Even a short visit would just exaggerate the allergy to cats as you inhale minute protein particles. They are in the air and in 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 this approach does not work well for dog and cat allergies.