The phenomenon of the increased risk of violence and death of stepchildren is referred to as the Cinderella effect. Borderline personality disorder
C-PTSD may share some symptoms with both PTSD and borderline personality disorder (BPD). However, there is enough evidence to also differentiate C-PTSD from borderline personality disorder. It may help to understand the intersection of attachment theory with C-PTSD and BPD if one reads the following opinion of Bessel A. van der Kolk together with an understanding drawn from a description of BPD:

Uncontrollable disruptions or distortions of attachment bonds precede the development of post-traumatic stress syndromes. People seek increased attachment in the face of danger. Adults, as well as children, may develop strong emotional ties with people who intermittently harass, beat, and, threaten them. The persistence of these attachment bonds leads to confusion of pain and love. Trauma can be repeated on behavioural, emotional, physiologic, and neuroendocrinologic levels. Repetition on these different levels causes a large variety of individual and social suffering. However, C-PTSD and BPD have been found by some researchers to be distinctive disorders with different features. Those with C-PTSD do not fear abandonment or have unstable patterns of relations; rather, they withdraw. There are distinct and notably large differences between BPD and C-PTSD and while there are some similarities – predominantly in terms of issues with attachment (though this plays out in different ways) and trouble regulating strong emotional affects – the disorders are different in nature.
One large study revealed around 84% of tinea manuum was associated with athletes foot, of which 80% admitted scratching their feet, and 60% were male,

Signs and symptoms
There is usually an itch, with generalised dry flaky thick skin of the palm of a hand. Frequently, one hand is affected, but it can be in both. If the back of the hand is affected, it may appear as reddish circles like in ringworm. Sometimes there are no symptoms. The feet may be affected as in two feet-one hand syndrome. Cause and mechanism
The most common cause is Trichophyton rubrum. Other causes include Trichophyton verrucosum (from cattle), Microsporum canis (from a cat or dog),  Trichophyton erinacei (from a hedgehog), Trichophyton mentagrophytes, Epidermophyton floccosum, Trichophyton interdigitale, and more rarely Microsporum gypseum, Trichophyton eriotrephon, and Arhroderma benhamiae.Tinea manuum can result from touching another area of the body with a fungal infection such as athletes foot or tinea cruris, contact with an infected person or animal, or from contact with soil or contaminated towels. Risk factors
Diabetes, high blood pressure, weak immune system, humid surroundings, excessive sweating, recurrent hand trauma and cracks in feet are risk factors for tinea manuum. Pet owners and farmworkers are also at higher risk. Diagnosis
Diagnosis is by visualization, direct microscopy and culture. Differential diagnosis
Psoriasis of the palms, pompholyx and contact dermatitis may appear similar. Treatment
Treatment is usually with long-term topical antifungal medications. If not resolving, terbinafine or itraconazole  by mouth might be options. Other options include  clotrimazole, fluconazole and ketoconazole.