Description: Douglas-fir trees, which are also called red firs, Oregon pines, and Douglas spruce, are neither true fir trees nor pines nor spruces! The scientific genus name Pseudotsuga means âfalse hemlock,â alluding to another kind of tree that Douglas-firs are similar too.Douglas-firs are evergreen trees, meaning that they keep their needle-like leaves year round.There are two varieties of this species, coast Douglas-fir and Rocky Mountain Douglas-fir, which are differentiated by their habitats, growth rates, and physical characteristics.he scientific genus name Pseudotsuga means âfalse hemlock,â alluding to another kind of tree that Douglas-firs are similar too. Douglas-firs are evergreen trees, meaning that they keep their needle-like leaves year round.
Chronic hives are defined as hives that last more than six weeks or hives that go away, but recur frequently. In most cases of chronic hives, a cause is never clearly identified. In some cases, chronic hives may be related to an underlying autoimmune disorder, such as thyroid disease or lupus.While the underlying cause of chronic hives is usually not identified, treatment can help with symptoms.ives and angioedema also occasionally occur in response to blood transfusions, immune system disorders such as lupus, some types of cancer such as lymphoma, certain thyroid conditions, and infections with bacteria or viruses such as hepatitis, HIV, cytomegalovirus or Epstein-Barr virus.
Skin tissues contain thyroid hormone receptors which, when occupied by thyroid hormones, stimulate cellular activity. Patients with hypothyroidism, or underactive thyroid disease, may experience skin symptoms that reflect diminished cellular skin activity in the absence of sufficient thyroid hormone.Some skin changes associated with hypothyroidism may cause itching.listering Rash. Dermatitis herpetiformis is a profoundly itchy, blistering rash that may occur in patients with hypothyroidism. Dermatitis herpetiformis â which is unrelated to the herpes viruses â typically affects the skin of the back, knees, elbows and buttocks on both sides of the body.