Molds are another year-round problem affecting allergy sufferers. Mold spores float in the air, much like pollen, increasing as temperatures rise in the Spring. Symptoms of a reaction to mold allergies include sneezing, itching, congestion, runny nose and dry, scaling skin. Mold spores may enter the nose and cause hay fever symptoms, or trigger asthma if they reach the lungs. Indoor molds and mildew need dampness, and thrive in basements, bathrooms or anywhere with a leaky water source.