A backfire is when the ignition of fuel doesn't take place in the ignition/combustion chamber, it(a backfire) can take place in the intake or exhaust. It can â¦ be caused by a fuel to air ratio not being correct, also if the timing of the spark is not just right that could cause it to back fire.
Melanoma in the United States. From 2005 to 2009, the median age at diagnosis for melanoma of the skin was 61, and the median age at death was 68. The age-adjusted incidence rate was 21.0 per 100,000 men and women per year.
Lentigo maligna is more common in males than females. The majority of patients with lentigo maligna are older than 40 years, and the peak age of diagnosis is be between 60 and 80 years. Unlike superficial spreading melanoma, lentigo maligna is not related to the number of melanocytic naevi (moles) or atypical naevi.