This case presents as chronic venous insufficiency with suspected venous thromboembolism.
Venous thrombosis usually presents with leg pain increased by both legs and/or by the dorsal flexion of the feet (Homans signs present in only 5% of cases).
Skin thickening and hyperpigmentation is a common finding.
Pulmonary thromboembolism should be ruled out in this case. It can present with normal lung sound, but with increased respiratory rate despite normal SpO2.