Cutting open the bitten area, an action often taken prior to suction, is not recommended since it causes further damage and increases the risk of infection; the subsequent cauterization of the area with fire or silver nitrate (also known as infernal stone) is also potentially threatening. Sucking out venom, either by mouth or with a pump, does not work and may harm the affected area directly. Suction started after three minutes removes a clinically insignificant quantity—less than one-thousandth of the venom injected—as shown in a human study. In a study with pigs, suction not only caused no improvement but led to necrosis in the suctioned area. Suctioning by mouth presents a risk of further poisoning through the mouths mucous tissues. The helper may also release bacteria into the persons wound, leading to infection. Immersion in warm water or sour milk, followed by the application of snake-stones (also known as la Pierre Noire), which are believed to draw off the poison in much the way a sponge soaks up water. Application of a one-percent solution of potassium permanganate or chromic acid to the cut, exposed area. The latter substance is notably toxic and carcinogenic. Drinking abundant quantities of alcohol following the cauterization or disinfection of the wound area. Use of electroshock therapy in animal tests has shown this treatment to be useless and potentially dangerous.In extreme cases, in remote areas, all of these misguided attempts at treatment have resulted in injuries far worse than an otherwise mild to moderate snakebite.
Erythrocyanosis crurum is a skin condition, a variant  of acrocyanosis caused by chronic exposure to cold. See also
Chilblains
List of cutaneous conditions

References
Otto Braun-Falco; G. Plewig; H. H. Wolff; Walter H. C. Burgdorf (2000). Dermatology. Springer Verlag. p. 889. ISBN 3-540-59452-3. James, William D.; Berger, Timothy G.;  et al. (2006). Andrews Diseases of the Skin: Clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0. == External links ==