Erythrodermic Psoriasis is distinguished from the other forms by intense inflammation and sloughing of the skin, and Pustular Psoriasis, or Psoriasis pustulosa, has lesions with fluid emerging and quite a lot of scaling.

There are two forms of  Pustular Psoriasis. The first, and worse, is called Von Zumbusch, and refers to pustular presence over the entire body. The other form is called Andrews-Barber whereby the pustules only show themselves at feet and or hands. This form occurs more often in women and is being associated with smoking. Psoriasis capitis, or scalp psoriasis, affects the hairy parts of the human head usually in combination with Psoriasis Vulgaris presence on other parts of the body. Scalp Psoriasis does not have an influence to hair quality or hair growth. Psoriasis unguium refers to psoriasis under the nails. One or more nails, on hand or feet or on both, can be affected. The psoriasis forms pits in the affected nails associated with some brown discoloring of the nails. In the worse case the nail removes it-self from its bed. Psoriasis arthropathica or arthritis psoriatica are a relatively seldom form of Psoriasis. This form of psoriasis does not only affect the skin but also creates infections in the joints. These infections are clinically different to those associated with rheumatic arthritis. In some cases one has the experience of the infection of the joints only and no skin infections.  Whatever the symptoms, itching, redness, scaling, crusting or flaking, the Bio-Force® line has been created to relieve them, while helping people with the disease to lead normal lives. For instance, instead of coal tar or steroids, Bio-Force® products use salicylic acid, allantoin and a unique range of peroxidized natural oils as active ingredients, which prevent, regress and delay the rate of epidermal cell division and multiplication and, consequently prevent the loss of protein delaying the overall psoriasis process. Unlike coal tar, Bio-Force® medications have no obtrusive color or unpleasant door. Coal tar also sometimes leaves stains on skin and/or clothing and has many other disadvantages with long term applications.