About

CATY is the perfect service for you to get an initial assessment of your skin

Take a picture of the skin change and upload it to this website. Depending on the selected service you will receive an assessment of the skin change and proposals on what to do next immediately or after a few hours.

What we offer

Easy to use

Our service is easy to use: Simply upload a picture of a skin lesion.

AI based risk assessment

We offer an Artificial Intelligence based risk assessment of localized skin changes. The AI system was trained with several thousand image examples. The reliability of the classification of new skin lesion was tested with scientific methods. Please note: The evaluation of your skin lesion is done by a computer program. The result should give you a first assessment. The use of this service does not replace a visit to the doctor!

Assessment by a experienced dermatologist

We offer the assessment of any skin changes by a team of experienced dermatologists. You will receive a doctor’ letter containg the diagnose, optional differential diagnoses and advice what to do next.

Skin complaints

Skin complaints are any medical condition that affects the integumentary system – the organ system that encloses the body and includes skin, hair, nails. The major function of this system is as a barrier against the external environment.

Complaints of the human integumentary system constitute a broad spectrum of diseases, also known as dermatoses, as well as many nonpathologic states. While only a small number of skin diseases account for most visits to the physician, thousands of skin conditions have been described. Classification of these conditions often presents many nosological challenges, since underlying causes and pathogenetics are often not known. Therefore, most current textbooks present a classification based on location, morphology, cause, and so on.


Clinically, the diagnosis of any particular skin condition is made by inspection and gathering information regarding the presenting skin lesion, including the location, symptoms, duration, arrangement, morphology and color. Some of disease also requires a skin biopsy which yields histologic information that can be correlated with the clinical presentation and any laboratory data.


To simplify matters, skin changes can be divided into two large groups:

Neoplasms of the skin

Actinic Keratoses or Solar Keratoses: Is a pre-cancerous area of thick, scaly, or crusty skin. These growths are more common in fair-skinned people and those who are frequently in the sun.

Basal cell carcinoma: Is the most common type of skin cancer. It often appears as a painless raised area of skin, which may be shiny with small blood vessels running over it.

Benign keratosis: Is a non-cancerous skin tumor that originates from cells in the outer layer of the skin. Like liver spots, benign or seborrheic keratoses are seen more often as people age

Dermatofibroma: Is a non-cancerous hard solitary slow-growing rounded bumps that may appear in a variety of colours, usually brownish to tan.

Melanocytic nevi: These benign lesions is also known as nevocytic nevus, nevus-cell nevus and commonly as a mole. It is a type of melanocytic tumor that contains nevus cells.

Melanoma: Is a type of cancer that develops from the pigment-containing cells known as melanocytes. Sometimes they develop from a mole with changes such as an increase in size, irregular edges, change in color, itchiness, or skin breakdown.

Vascular skin lesions: Is a benign vascular abnormality

Skin changes from other diseases

Allergy: Allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis.

Inflammation: Is part of the complex biological response of body tissues to harmful stimuli, such as pathogens, damaged cells, or irritants. Inflammation is not a synonym for infection and can be either acute or chronic.

Autoimmune disease: Is a condition arising from an abnormal immune response to a normal body part. There are at least 80 types of autoimmune diseases. Nearly any body part can be involved. The cause is generally unknown.

Choose a service

We offer you various services – either by Artifical Intelligence or by experienced dermatologists. Please choose the one that suits you best.