The symptoms of the inherited form of<unk>  are not usually present at birth but generally develop between three months and five years of age. The symptoms will often improve with age, although they may grow more severe again in old age. The condition is not life-threatening; the impact on the patient, if it is a mild case, is generally restricted to mild itching and the social impact of having skin with an unusual appearance. People with mild cases have symptoms that include scaly patches on the shins, fine white scales on the forearms and upper arms, and rough palms. People with the mildest cases have no symptoms other than faint, tell-tale "mosaic lines" between the Achilles tendons and the calf muscles. Mild presentation of<unk> : faint, mosaic lines are visible on the calf Severe cases, although rare, do exist. Severe cases entail the buildup of scales everywhere, with areas of the body that have a concentration of sweat glands being least affected. Areas where the skin rubs against together, such as the armpits, the groin, and the "folded" areas of the elbow and knees, are less affected. Various topical treatments are available to "exfoliate" the scales. These include lotions that contain alpha-hydroxy acids. Associated conditions Many people with severe ichthyosis have problems sweating due to the buildup of scales on the skin. This may lead to problems such as "prickly itch", which results from the afflicted skin being unable to sweat due to the buildup of scales, or problems associated with overheating. The majority of people with<unk>  can sweat at least a little. Paradoxically this means most would be more comfortable living in a hot and humid climate. Sweating helps to shed scales, which improves the appearance of the skin and prevents "prickly itch". The dry skin will crack on digits or extremities and create bloody cuts. Skin is painful when inflamed and/or tight. For children and adolescents, psychological concerns may include inconsistent self-image, mood fluctuating due to cyclical outbreaks, tendency to addiction, possibility of social withdrawal when skin is noticeably infected, and preoccupation with appearance. Strong air conditioning and excessive consumption of alcohol can also increase the buildup of scales. Over 50% of people with<unk>  have some type of atopic disease such as allergies, eczema, or asthma. Another common condition associated with<unk>  is keratosis pilaris (small bumps mainly appearing on the back of the upper arms).
Ichthyosis vulgaris
Lamellar ichthyosis
Ichthyosis acquisita
Urticaria pigmentosa
Ichthyosis bullosa of Siemens
Phytophotodermatitis
Pomade acne
Alopecia mucinosa