Electromagnetic Initiation and Propagation of Bipolar Radiofrequency Tissue Reactions via Invasive Non-Insulated Microneedle Electrodes.

Radiofrequency (RF) energy can be emitted into the skin, either non- or invasively, via a monopolar mode that utilizes an active electrode and a grounded electrode or via a bipolar mode that employs two active electrodes. In this experimental study of RF tissue reactions, bipolar RF energy was emitted in vivo to micropig skin at varying microneedle penetration depths, signal amplitudes, and conduction times. Immediately after RF treatment, skin samples exhibited RF-induced coagulation columns of thermal injury, separately generated around each microneedle in the dermis.

Allergic contact dermatitis to proparacaine with subsequent cross-sensitization to tetracaine from ophthalmic preparations.

We report 2 cases of allergic contact dermatitis (ACD) to proparacaine and tetracaine. Patient 1 is an ophthalmologist with chronic finger pad dermatitis sensitized to the topical anesthetic proparacaine. Despite discontinuance of proparacaine and substitution with a patch test negative agent, tetracaine, his hand dermatitis persisted.

Contact urticaria and anaphylaxis to the fungicide chlorothalonil.

Chlorothalonil, a common fungicide used for agricultural and horticultural purposes is capable of eliciting contact urticaria. In our patient, an anaphylactoid reaction resulted from intact skin contact to diluted chlorothalonil (0.01 percent aqueous).

An international survey on the prognosis of occupational contact dermatitis of the hands.

Prognosis is a crucial topic in contact dermatitis. We recently reviewed the extensive literature on the prognosis of contact dermatitis. The majority of patients in these studies had persistent dermatitis.

Contact dermatitis: prognosis, risk factors, and rehabilitation.

This article reviews the prognosis for irritant and allergic contact dermatitis and occupational and nonoccupational contact dermatitis. Factors adversely affecting prognosis are discussed. Rehabilitation of the patient with disabling contact dermatitis is considered.

The prognosis of contact dermatitis.

This article reviews the prognosis of contact dermatitis, particularly of occupational contact dermatitis. Most studies document a poor prognosis for occupational and nonoccupational contact dermatitis. The prognoses of occupational and nonoccupational contact dermatitis, irritant contact dermatitis, and allergic contact dermatitis are similar.

Histiocytoid hemangioma: a disease spectrum. Report of a case with simultaneous cutaneous and bone involvement limited to one extremity.

The collective term histiocytoid hemangioma encompasses a spectrum of diseases that share a histologic features characterized by distinctive histiocytoid endothelial cells. Several incompletely defined cutaneous and extracutaneous vascular tumors, including atypical pyogenic granuloma, pseudopyogenic granuloma, papular angioplasia, angiolymphoid hyperplasia with eosinophilia, Kimura's disease, and inflammatory arteriovenous hemangioma, have been included in this group. We describe a 31-year-old Mexican-American man with multiple histiocytoid hemangiomas involving skin, subcutaneous tissue, and bone limited to the left arm and hand.

Allergic sensitization to a non-bisphenol A epoxy of the cycloaliphatic class.

This is the first report of sensitization to a cycloaliphatic epoxy. Allergic contact dermatitis occurred in an electron microscopist after exposure to the cycloaliphatic epoxy, vinyl cyclohexene diepoxide. Cycloaliphatic epoxies are not based on the diglycidyl ether of bisphenol A (DGEBA), presently the epoxy of greatest commercial usage.

Cutaneous allergy to mustard in a salad maker.

A case of allergic contact dermatitis to mustard (Brassica nigra) in a salad maker is reported. The sources of skin contact included a commercial salad cream, a vinegrette, and various members of the mustard family, Cruciferae. The Cruciferae family includes many salad vegetables and condiments which contain allergenic isothiocyanates.