Do you already know the color and location of keratin and hemoglobin?
An important colour pigment in the skin is keratin. It has a colour spectrum of namely yellow, orange and white.
If keratin is in the stratum corneum, it appears in its own colour: yellow to white.
If there is a mixture of keratin and melanin, the colour orange develops.
Fibrous tissue of the deeper dermis causes the keratin stored there to appear white.
Another hue in skin lesions can be caused by haemoglobin. As you already know from the colour of arteries and veins, hemoglobin is light red in an oxygenated state and violet blue in a deoxygenated state.